Apple's mail and IMAP

Okay so I have my IMAP account running into MAIL. Everything is great. EXCEPT I dont have any of my Sent messages. Even though there is a folder there, nothing goes in there. I also have the box check inside the preferences that says save sent message to sent folder. What am I missing? thanks for the help in advance.

The wiki is your friend:


Thanks, I skimmed though it and thought I did everything, BUT must have missed that. thanks for taking the time to post your response.